If you like screencaps…

…Then you should visit Screenmusings, a site in which you can find several still images from lots of movies and TV shows. Of course, there’s a section dedicated to Roger Rabbit, and you can find several screencaps from the movie (in fact, the whole movie was screen-captured) that you can use for make signatures, wallpapers, avatars and whatever you want.

But p-p-p-p-please be aware these are only for your personal use. Any commercial or unauthorized use is prohibited and prosecuted by law.